Segment Information - Details of Segment Information- Statement of Financial Condition (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 855,263	$ 821,923	$ 590,028	$ 561,179
Goodwill	165,960	167,539
Other segment assets	5,831,676	5,775,808
Total assets	6,852,899	6,765,270
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	99,812	100,893
Goodwill	145,761	147,396
Other segment assets	5,608,912	5,545,611
Total assets	5,854,485	5,793,900
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	751,201	717,643
Goodwill	0	0
Other segment assets	4,097	3,533
Total assets	755,298	721,176
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	4,250	3,387
Goodwill	20,199	20,143
Other segment assets	218,667	226,664
Total assets	$ 243,116	$ 250,194